static String? _convertCssToArgb()

in lib/src/property.dart [226:276]
47 lines of code
17 McCabe index (conditional complexity)

  static String? _convertCssToArgb(String value) {
    // TODO(terry): Better parser/regex for converting CSS properties.
    var color = value.trim().replaceAll('\\s', '');
    if (color[0] == '#') {
      var v = color.substring(1);
      Color.hexToInt(v); // Valid hexadecimal, throws if not.
      return v;
    } else if (color.isNotEmpty && color[color.length - 1] == ')') {
      int type;
      if (color.indexOf('rgb(') == 0 || color.indexOf('RGB(') == 0) {
        color = color.substring(4);
        type = _rgbCss;
      } else if (color.indexOf('rgba(') == 0 || color.indexOf('RGBA(') == 0) {
        type = _rgbaCss;
        color = color.substring(5);
      } else if (color.indexOf('hsl(') == 0 || color.indexOf('HSL(') == 0) {
        type = _hslCss;
        color = color.substring(4);
      } else if (color.indexOf('hsla(') == 0 || color.indexOf('HSLA(') == 0) {
        type = _hslaCss;
        color = color.substring(5);
      } else {
        throw UnsupportedError('CSS property not implemented');
      }

      color = color.substring(0, color.length - 1); // Strip close paren.

      var args = <num>[];
      var params = color.split(',');
      for (var param in params) {
        args.add(double.parse(param));
      }
      switch (type) {
        case _rgbCss:
          return Color.convertToHexString(
              args[0].toInt(), args[1].toInt(), args[2].toInt());
        case _rgbaCss:
          return Color.convertToHexString(
              args[0].toInt(), args[1].toInt(), args[2].toInt(), args[3]);
        case _hslCss:
          return Hsla(args[0], args[1], args[2]).toHexArgbString();
        case _hslaCss:
          return Hsla(args[0], args[1], args[2], args[3]).toHexArgbString();
        default:
          // Type not defined UnsupportedOperationException should have thrown.
          assert(false);
          break;
      }
    }
    return null;
  }